Copyright labeling of digitized image data

This article addresses the problem of embedding a robust copyright label into image data for identifying the ownership and distribution of the digitized image. The article first defines a reasonable set of functional requirements and design criteria for an image copyright labeling system, and then describes a labeling method using a JPEG model-based, frequency-hopped, randomly sequenced pulse position modulated code (RSPPMC). Our experiments demonstrated that the proposed method meets the requirements for copyright protection, including the robustness of an embedded label against several damaging possibilities such as lossy data compression, low-pass filtering, and color space conversion, as well as printing/scanning, scaling, and cropping     

Determining Q using S parameter data

A method is presented for determining frequency selectivity (Q) of a network using scattering (S) parameter data, data that is readily available from network measurements or analysis. The approach is based on a formulation for Q that uses the change in reactance of the resonant circuit with frequency. The method yields accurate Q results for both high and low Q resonators. Furthermore, the method is easy to implement and to understand. An example is given for calculating the Q of a tapped-stub resonator. Using this example, the new method is compared to the critical points (CP) method, an approach based on a Foster network type of formulation     

抽油机减速器运行工况数字化管理系统的设计

设计了油田抽油机减速器运行工况数字化管理系统,通过外接安装各种传感器,实现了抽油机的远程启动及运行工况的监测,超限停机声光报警。实时获取减速器油温、油质、油位等参数的信息。实现各单井状态的集中监控,缩短了故障发现和排除周期,提高了劳动效率,强化了油田现代化管理水平。同时也为减速器润滑油过程多参数复合检测开创了一种全新的理念。     

Border detection on digitized skin tumor images

A radial search technique is presented for detecting skin tumor borders in clinical dermatology images. First, it includes two rounds of radial search based on the same tumor center. The first-round search is independent, and the second-round search is knowledge-based tracking. Then a rescan with a new center is used to solve the blind-spot problem. The algorithm is tested on model images with excellent performance, and on 300 real clinical images with a satisfactory result.     

Atomic precision patterning on Si: An opportunity for a digitized process

H depassivation lithography is a process by which a monolayer of H absorbed on a Si(1 0 0) 2 × 1 surface may be patterned by the removal of H atoms using a scanning tunneling microscope. This process can achieve atomic resolution where individual atoms are targeted and removed. This paper suggests that such a patterning process can be carried out as a digital process, where the pixels of the pattern are the individual H atoms. The goal is digital fabrication rather than digital information processing. The margins for the read and write operators appear to be sufficient for a digital process, and the tolerance for physical addressing of the atoms is technologically feasible. A digital fabrication process would enjoy some of the same advantages of digital computation; namely high reliability, error checking and correction, and the creation of complex systems.     

四波段空间调制器获取数字化多光谱图像

提出了一种四波段空间调制器获取目标多光谱图像的方法,给出了其结构设计、制备方案;讨论了该方法的编码和解码原理并进行了模拟实验,验证了利用它进行多光谱照相的可行性.结果表明,该方法克服了传统多光谱摄影中采用"多波多路"方法的系统复杂、造价高和实施困难的缺点.     

Detection of architectural distortion from the ridges in a digitized mammogram

Architectural distortion (AD) has been described as a focal retraction of the breast tissue. Blood vessels, milk ducts and spicules in the breast tissue appear as ridges in the mammogram. We hypothesize that radiating ridges are an indicator of an AD site. Using a window-based approach, features derived from the ridges have been utilized in a radial basis function support vector machine to classify regions as containing or not containing AD. The classification is performed on the Mammographic Image Analysis Society (MIAS) database and on the Digital Database For Screening Mammography (DDSM). The proposed approach reports peak performance of a sensitivity of 90% (93%) at 26 (17) false positives per mammogram in the MIAS (DDSM) database.     

A test of independence based on a generalized correlation function

In this paper, we propose a novel test of independence based on the concept of correntropy. We explore correntropy from a statistical perspective and discuss its properties in the context of testing independence. We introduce the novel concept of parametric correntropy and design a test of independence based on it. We further discuss how the proposed test relaxes the assumption of Gaussianity. Finally, we discuss some computational issues related to the proposed method and compare it with state-of-the-art techniques.     

基于传统互感器的数字化变电站建设研究

随着数字化变电站的发展,IEC61850通信协议也得以不断推广,数字化变电站的建设也由理论研究阶段走向工程实践阶段。针对现阶段实际情况,提出分阶段进行传统变电站数字化改造的实施方案,有效地利用现有设备,最大限度地减少投资和工程量,充分发挥数字化变电站的优点,使当前正在运行的传统变电站平滑过渡到数字化变电站,为数字变电站的快速推广奠定技术基础。     

Antenna beamwidth independence of measured rain attenuation on a 28-GHz Earth-space path

Rain attenuation measured at 28 GHz on an earth-space path is independent of antenna beamwidth for beamwidths as small as0.1degand for attenuations up to 30 dB. The measurements imply that angle-of-arrival fluctuations are less than0.02deg.     

Fourier demixing filter based on statistical independence betweensignals

A new filter based on the statistical independence between signals is presented. The original signal is estimated by the weighted sum of each harmonic of the observation corrupted by noise. The filter is synthesised by adjusting the weighting parameters by learning with the use of higher order moments of observation noise without any information about the dynamics of a target system     

提高激光告警系统信噪比的研究

归纳一般激光告警系统模拟式处理脉冲激光信号的不足,提出以FPGA为核心的数字化激光告警信号处理系统.对脉冲激光信号进行A/D转换后,利用FIR数字滤波结合自相关检测的方法对脉冲激光信号进行处理,尽可能的把脉冲激光信号从干扰中充分恢复出来,以便告警装置能够迅速做出告警.经MATLAB仿真证明方法可行,并对其进行实验测试,...     

Putting data on a diet

The use of data compression to reduce bandwidth and reduce storage requirements is discussed. The merits of lossless versus lossy compression techniques, the latter offering far greater compression ratios, are considered. The limits of lossless compression are discussed, and a simple method for lossless compression, runlength encoding, is described, as are the more sophisticated Huffman codes, arithmetic coding, and the trie-based codes invented by A. Lempel and J. Ziv (1977, 1978), WAN applications as well as throughput and latency are briefly considered     

基于有线无线互联技术的数字化校园建设系统设计

传统的数字化校园建设系统涉及范围窄,模块之间联系不紧密。为了解决上述问题,基于有线无线互联技术设计了一种新的数字化校园建设系统。对系统的硬件进行重点设计,构建网络架构层、数据层、服务层、拓展服务层和虚拟校园层五个建设层次,设计传感器、编码器和电路图。通过硬件部分设计软件流程,包括数据采集、数据传感、数据处理和建设结果显示四步。与传统建设系统进行实验对比,结果表明,基于有线无线互联技术设计的数字化校园建设系统能够将各个模块紧密连接到一起,扩大了建设系统涉及的范围。     

微型计算机在数字化仿形数控系统中的应用

说明数字化,仿形和数控的功能,分析微机闭环控制系统,提出对微型计算机的要求.     

红外化学遥感数字信号处理算法的研究进展

介绍了几种为远距离红外蒸汽信号监测开发的分类器设计，频域数字滤波，时域数字滤波等数字信号处理技术。对线性分类器，分段线性分类器和神经网络分类器等在红外化学遥感系统中的应用做了初步的探讨。对背景扣除技术，频域数字滤波技术，数字滤波的切趾方法等做了简要的描述。阐述了时域滤波技术的基本原理及实际应用。展望了红外化学遥感数字信号处理算法的研究前景。     

Integrating device independence and user profiles on the Web

This paper describes research to enable appropriate knowledge to be automatically delivered to the right people at the right time at the right level of detail via a range of user devices (laptop PC, mobile telephone, wireless e-mail client, hand-held PC, etc). We describe a framework that integrates device profiles with user preference profiles and accessibility requirements to provide effective knowledge delivery to a range of end-user devices. The framework has two components — an ontology of device and user profiles, and a content adaptation engine for presenting information to the user in a suitable format.     

一种数显模拟除法器及其在测量电路中的应用

介绍了一种采用双积分原理的数显模拟除法器。它具有高的运算精度、良好的抗干扰能力和直接数字化的运算结果,且能用单片Ａ／Ｄ转换器容易地实现。测试了用ＩＣＬ７１０６构成的数显模拟除法器的性能,其准确度可达到±０．８％Ｄｎ＋１字。给出了数显模拟除法器测量稳压二极管微分电阻ｒｚ的应用实例。     

Determining Repeater Margin with a Stub and Attenuator

The margin of a high-speed digital regenerative repeater can be determined easily by adding a misterminated stub at the repeater input. The stub adds an interfering signal which, if large enough, will cause the repeater to make errors. The amplitude of the interfering signal is determined by the termination, so the termination impedance at which errors begin is a good measure of repeater margin. No calibration procedure is required.     

基于DSP的起动机用电磁开关数字化控制设计

简要介绍直流起动机控制的基本原理,在此基础上提出当前起动机用电磁开关的控制弊端,并设计了新的数字化控制方法。该方法通过DSP和功率MOS实现将电磁开关控制电路中,开关信号部分与大电流的线圈控制部分分开,不仅有效的解决了当前起动机用电磁开关的控制开关过大电流的问题,而且解决了起动机为多种类型时电磁开关的控制问题。同时,该设计还具有控制方法简单,容易实现等特点。实验结果表明,该设计满足控制要求,具有很好的应用推广价值。